Найдите область определения функции:

1)y=x+6/5-x≡≡≡≡≡≡≡≡2)x+3/8.9+2x

3)y=x(x-4)/x-4≡≡≡≡≡≡≡4)y=x^2/x^2-7x

Помогите пожалуйста, очень нужно!
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